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| Number | Title | Issue Date |
| 7434489 | Bicycle drive system A bicycle drive system includes a front gear face, a rear gear face, a front guide assembly, a rear guide assembly, and a drive shaft coupled to a rear-suspension frame via a rear hub and a crank spindle. The bicycle drive system operates independently of the frame.... | 10/14/2008 |
| 7036392 | Transmission system having a gear with engaging and non-engaging semi-annular sections A transmission system including a first gear comprising a first side having an engaging semi-annular section and a non-engaging semi-annular section; and a plurality of engaging gears for engaging with the engaging semi-annular section, wherein the engaging gears ar... | 05/02/2006 |
| 6786497 | Transmission system for cycle type vehicle A power transmission system for a cycle type vehicle having at least a pair of wheels, such as a bicycle, for providing multiple speeds thereto. The system comprises a housing mounting a planar, circular pinion gear plate, mounted for rotation on a pedal powered rot... | 09/07/2004 |
| 6158296 | Transmission with structurally simplified gear ratio A transmission (1) comprising a gear assembly for transmitting a rotary motion from a driving shaft (2) to a driven shaft (3), with variable gear ratio, the two shafts (2 and 3) not being coaxial. This transmission consists in: a gear-wheel (4) axially sp... | 12/12/2000 |
| 6112609 | Gear arrangement A gear arrangement 10 which comprises a first disc member 12 rotatable about a first axis 14 and carrying rings 16 of teeth 18, the rings 16 being centered on the axis 14 and at respective distances therefrom. A second member 20 is rotatable about a secon... | 09/05/2000 |
| 6044722 | Variable torque transmission A variable torque transmission includes at least one disc-shaped gear 30 having a circular toothed surface 36 with flat beveled teeth 32 that mate along radius 38 with the cone-shaped teeth of pinion gear 10 to produce an infinitely variable lever arm and... | 04/04/2000 |
| 5622081 | Multiple speed shaft drive for a bicycle A multiple speed shaft drive for a bicycle, including: a forward disk having a plurality of concentrically disposed ring gears, wherein the forward disk is connected with the pedal crank of the bicycle; a rearward disk having a plurality of concentrically... | 04/22/1997 |
| 5496049 | Variable drive mechanism for cycle type vehicles A drive mechanism for a cycle vehicle is disclosed herein for selectively importing a driving force from a pedal operated front gear drive section to a rear gear driven section via a variable transmission. The drive section and the driven section include ... | 03/05/1996 |
| 5467660 | Variable-speed gear mechanism A variable-speed gear mechanism comprises a pinion with spring-biased radial pins and a face gear with an operative face that meshes with the pinion at various meshing radii. The gear has a central part which defines a radially innermost set of part-cylin... | 11/21/1995 |
| 5222405 | Infinitely-variable positive drive transmission A transmission including at least two shafts and a cylindrical member supported by a frame for rotation relative thereto about axes of rotation utilizes a pair of gears and a plurality of speed-adjusting teeth for altering the relative speed of rotation b... | 06/29/1993 |
| 5065638 | Variable ratio transmission A variable ratio transmission comprises a pinion with spring loaded pins mounted on a face gear which is a disc with one of the plate-like surfaces containing a plurality of grooves separated by crowns extending from the periphery of the disc. At intermit... | 11/19/1991 |
| 4813302 | Speed changing mechanism A speed changing mechanism operable during both kinetic and static conditions. A gear 28 driven by bicycle pedals 30 in turn drives gear 32. Holes 38 in the face of the latter gear are engaged by gear 64 which is integral with output shaft 42. One end 72 ... | 03/21/1989 |
| 4447068 | Bicycle drive mechanism An improved bicycle drive assembly characterized by an elongated, rotary drive shaft, a front gear assembly coupling the forward end of the drive shaft to the bicycle's crank-and-pedal assembly, a disk gear provided with a plurality of radial grooves on i... | 05/08/1984 |
| 4299133 | Gearing A gearing has on its driving shaft a drive means carrier member carrying drive means in the form of pins protruding towards a driven means carrier member fixed to the driven shaft and carrying divergently arranged driven means. The driven shaft is offset ... | 11/10/1981 |
| 4289487 | Swimming device A mechanical apparatus for moving a swimmer ahead in the water, including a frame secured behind the swimmer by shoulder straps and a waist belt, a pair of bicycle type foot operated pedals rotating a propeller and a hand-cranked winch on the belt buckle ... | 09/15/1981 |
